Goutte won't load an ASP SSL page

I am trying out Goutte, the PHP web crawler based on Symfony2 components. I've successfully retrieved Google in both plaintext and SSL forms. However, I've come across an ASP/SSL page that won't load.

Here's my code:

// Load a crawler/browser system
require_once 'vendor/goutte/goutte.phar';

// Here's a demo of a page we want to parse
$uri = '(removed)';

use Goutte\Client;

$client = new Client();
$crawler = $client->request('GET', $uri);
echo $crawler->text() . "\n";

Instead, the echo at the end of the above code, for this one site, gives me this:

Bad Request (Invalid Header Name)

I can see the site fine in Firefox, and the HTML for it can be retrieved fine using wget --no-check-certificate with no other options (setting the header or user agent, for example).

I suspect I need to set some HTTP headers in Goutte. Which ones should I try next?

Solution

I discovered that my browser and wget both add a non-empty user agent field in the header, so I am assuming Goutte sets nothing here. Adding this header to the browser object prior to the fetch fixes the problem:

// Load a crawler/browser system
require_once 'vendor/goutte/goutte.phar';

// Here's a demo of a page we want to parse
$uri = '(removed)';

use Goutte\Client;

// Set up headers
$client = new Client();
$headers = array(
    'User-Agent' => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:21.0) Gecko/20100101 Firefox/21.0',
);
foreach ($headers as $header => $value)
{
    $client->setHeader($header, $value);
}

$crawler = $client->request('GET', $uri);
echo $crawler->text() . "\n";

Here I've copied in my browser agent string, but in this case I think anything would work - as long as it is set.

Incidentally, I used a browser UA here as I was trying to accurately replicate the browser environment for debugging this particular problem. Once it worked I switched to a custom UA, so target sites can detect it as a bot if they wish to (for this project I don't think anyone has).